Steam-generator



(No Model.)

G. H. SHAW.

.2 sneets -sheet 1.

STEAM GENERATOR.

Patented May 30,1893.

I f f f f A awe/Mex el ttozumza (No Model.) I l 2 sheets-sh et 2. v G. H. SHAW.

STEAM GENERATOR.

No. 498,699. Patented May 30, 18.93.

UNITED STATES PATENT" FFICE.

CHARLES H. SHAW, OF DENVER, COLORADO.

,STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 498,699, dated May 730, 1893.

Application filed September 19.1892. Serial No. 446,323. (No model.)

To all whom it may concern. f

Be it known that I, CHARLES H. SHAW, a citizen of the United States,residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new anduseful Improvements in Steam Generators, of which the following is a specification;

- g My invention relates to steam generators,

and more particularly to that class of steam generators of the sectional water tube type.

The objects of myinvention are to produce a water tube steam generator which shall be safe to operate, and shall be economical in use,

\ that'shall furnish a free unobstructed and directcirculation,thatshall havesufiicient water space to furnish a constant supply for the descending circulation, and a large water surface for the delivery of steam into the steam chamber, that shall have a large amount of lines 11 Fig. 2.

Isteam space, that shall be simple of construction, and easy to get at for cleaning and repairs.

To these ends my invention consists in a steam generator embodying the features of construction, arrangement and having the mode of operation substantially su'ch as is hereinafter more particularly pointed out.

Referring to the accompanying drawings in which I have illustrated an embodiment of my invention, Figure '1, shows a large front elevation and a part sectional end view on the Fig. 2, is a side elevation,

the brickwork being removed to clearly show the construction and arrangement of the parts of the generator. Fig. 3 is a detailed enlarged sectional view of the metallic ring joints and bolts.

As above intimated my invention involves a water tube steam generator in which by means of certain features of construction and forms and arrangements of parts, I am enabled to provide a boiler fulfilling the objects of the invention above stated in an essential and rear portions of the boiler-,an'd serving as a means for supporting the connecting tubes B. These chambers may be made of various materials, preferably of cast steel, and should be ofsuch a character that they are capable of withstanding high pressure. I

These tubes are arranged in groups, each group consisting of a number of small tubes I), having their ends connected to the chain her. A, by expanding the endsv of the tube in the openings a, formed therein, and while a diderent number of tubes can'be grouped together, I find it convenient and desirable to arrange a series of openings in acircle as six,

and a single one in the center of the circle, so

that each group of tubes'consists of seven small tubes b,'having their respective ends united in a single chamber A. There may be anydesirable number of these groups of tubes according to the purposes for which the generator is to be used, but it will be observed thateach group or any number of groups of, chambers and tubes form a complete generating and circulating system. These groups of tubes are of the desired size, length and number, and are suitably mounted and connected together preferably in the manner hereinafter set forth, and above each group or series of groups is arranged a plain cylinder tube or series of tubes O, and these tubes are connected to the circular heads or chambers A at each end, so that they may readily be connected to the group or groups of tubes. Above these plain cylindrical tubes 0, is arranged a steam drum I), at right angles to the groups of tubes,and this steam drum is provided with the usual safety valve D, or other appliance, While below and preferably at the rear of the groups of tubes is arranged a mud drum E. r

The chamber A carrying the groups of tubes, as well as the plain cylindrical tubes are provided above and below with metallic ring joints by means of whichany number of groups of tubes may be readily united, and

while these joints may be variously shaped, I

prefer to form them in the manner shown in threaded plugs H, which are accessible from I the outside, and by means of which the tubes can be readily cleaned- The groups oftubes being thus united are arranged over the usual grate, and interposed between each layer or row of groups of tubes I have arranged firebrick tiling I, I, &c., extending nearly the entire length of the tube, and leaving a space at one end of each group alternately for the purpose of carrying the products of combustion throughout the length of the several series of groups of tubes, and the cylindrical tube to the combustion exit. 1 i

- Such being thegeneral construction and arrangement of'thegenerator, it will be found that the objects aimed at are accomplished, in that by making the generator in sections, i

and these sections of small diameter, it is almost absolutely safe under very high pressure. Furthermore, great economy in fuel is the result of presenting the water to the action of the fire in small bodies, and in my construction the water circulates through the firechamber in the small tubes of the groups which are preferably not over three inchesin diameter, and as the products of combustion are controlled and directed by the tiling I, to

impinge upon each and all of the tubes, the greatest economy is produced, and the heat and gases are prevented from passing away through the Smokestack until all the available heat has been utilized. Furthermore by this arrangement, I obtain a free unobstructed and direct circulation of the Water,

astheheat appliedv to the small tubes of the groups causes it to ascend through the front chamber A,'and to pass into the top and large cylindrical tube 0, from whence it passes to the rear chambers A, and down through these chambers and distributes itself to the small tubes B. The large size of the opening between the chambers A and the unobstructed fiow of the water through the large cylinder 0, reduce the velocity at which thewater travels, thereby giving a Water line that is comparatively steady, and free from agitation, and there is a-sulficient'sp'ace to furnish a constant supply for the descending circulation, and a large water surface for the delivery of steam into the steam chamber.

In use the rear portions of the plain cylinder 0, are preferably kept constantly full of water, the water line extending from the front head of the cylinders to a point-a little in front of the middle of the cylinder, and this not only gives a full supply of water to the chambers and tubes below, but furnishes a large surface for the delivery of steam and tends to reduce the agitation at the water line. The steam drum extending at right angles to the large cylinders in connection with the space in the cylinders above the -water gives adequate steam room. It will also be seen that the construction of the boiler is exceedingly simple, the generator being made in small sections, each composed,-

of a front and back chamber to which the small tubes constituting each group are connected, and these sections can be readily transported and secured'together when the boileris set up, and by the use of the threaded plugs all parts are easy of access, for cleaning and repairing, and for the removal and replacing of any of the tubes when necessary,

and the whole arrangement has been found to be efficient and economical.

' What'I claim is+- 1-. Asectional steam generatorcomprisinga series of circular groupsof tubes,each group of tubes being provided with a circular head or chamber at each end, "and the heads or chambers being provided with metallic ring joints by means of which they are united to form the generatonsubstantially as-described. I 2. A steam generator comprising a-series of circular groups of small tubes, each group being provided with a circular head or c-hamber at each'end, the heads or chambers being provided with metallic ri'ngjoints by means of which they are united, and also having the threaded plugs at their outer end, substantially as described.

a. A st-eamgenerator comprising a-series of groups of small tubes, each group consisting of a number of tubes connected at their ends by hollow chambers, the chambers being provided with metallic ring join-ts, a series of plain cylinders also provided with chambers arranged above the groups of tubes and parallel thereto, a steam drum arranged above the plain cylinders at right angles thereto, and a mud drum arranged below the groups of cylinders, substantially as described.

4. The combination with a suitable fire grate, of a steam generator comprising a number of groups of tubes arranged at an angle, each group being connected to a cylinder at each end, each cylinder having metallic ring joints by means of which they are connected together, and provided with screw plugs at their outer ends, a plain cylinder provided with chambers at each end arranged parallel to the groups of tubes,-a steam drum arranged above the plain cylinders at right angles thereto and connected by metallic ring joints, and tiling arranged above each series of groups of tubes leaving aspace at one end of each group alternately, the whole being constructed and arranged substantially as and for the purposes set forth. V

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES H. SHAW.

Witnesses:

WILLIAM H. 'HoLMEs,

JOHN A. LIMB. 

